1/*
2 * Copyright (C) 2011 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "CGUtilities.h"
28
29#include <wtf/RetainPtr.h>
30
31namespace WebKit {
32
33void paintImage(CGContextRef context, CGImageRef image, CGFloat scaleFactor, CGPoint destination, CGRect source)
34{
35    CGContextSaveGState(context);
36
37    CGContextClipToRect(context, CGRectMake(destination.x, destination.y, source.size.width, source.size.height));
38    CGContextScaleCTM(context, 1, -1);
39
40    CGFloat imageHeight = CGImageGetHeight(image) / scaleFactor;
41    CGFloat imageWidth = CGImageGetWidth(image) / scaleFactor;
42
43    CGFloat destX = destination.x - source.origin.x;
44    CGFloat destY = -imageHeight - destination.y + source.origin.y;
45
46    CGContextDrawImage(context, CGRectMake(destX, destY, imageWidth, imageHeight), image);
47
48    CGContextRestoreGState(context);
49}
50
51void paintBitmapContext(CGContextRef context, CGContextRef bitmapContext, CGFloat scaleFactor, CGPoint destination, CGRect source)
52{
53    RetainPtr<CGImageRef> image = adoptCF(CGBitmapContextCreateImage(bitmapContext));
54    paintImage(context, image.get(), scaleFactor, destination, source);
55}
56
57} // namespace WebKit
58